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文章介绍

Java 代码通过 Scanner 获取输入的正整数，利用 while 循环结合取余（%10）和整除（/10）操作拆分数字的每一位并累加，最终输出该数的各位数字之和。

项目结构

1.案例Algorithm01

packageProgramDesign;publicclassAlgorithm01{publicstaticvoidmain(String[]args){int[]a={9,7,4,6,3,1,10};for(inti=0;i<a.length-1;i++){for(intj=0;j<a.length-1-i;j++){if(a[j]>a[j+1]){inttemp=a[j];a[j]=a[j+1];a[j+1]=temp;}}}for(intnum:a){System.out.print(num+" ");}}}

运行结果

2.案例Algorithm02

packageProgramDesign;publicclassAlgorithm02{publicstaticvoidmain(String[]args){intcount=0;for(inti=100;i<=300;i++){if(i%7==0&&i%3!=0){System.out.print(i+" ");if(++count%5==0)System.out.println();}}}}

运行结果

3.案例Algorithm03

packageProgramDesign;publicclassAlgorithm03{publicstaticvoidmain(String[]args){longsum=0;for(inti=3;i<=11;i++){longfact=1;for(intj=1;j<=i;j++)fact*=j;sum+=fact;}System.out.println("阶乘和为："+sum);}}

运行结果

4.案例Algorithm04

packageProgramDesign;importjava.util.Scanner;publicclassAlgorithm04{publicstaticvoidmain(String[]args){Scannersc=newScanner(System.in);intn=sc.nextInt(),sum=0,i=1;while(i<=n)sum+=i++;System.out.println("1"+"到"+"n"+"的和"+sum);}}

运行结果

5.案例Algorithm05

packageProgramDesign;importjava.util.Scanner;publicclassAlgorithm05{publicstaticvoidmain(String[]args){Scannersc=newScanner(System.in);intn=sc.nextInt(),sum=0;while(n>0){sum+=n%10;n/=10;}System.out.println(sum);}}

运行结果